Telephone system



7 Nov 3, 1931.

F. A. KORN ET AL TELEPHONE SYSTEM Filed Aug. 4. 1930 //v VEN mks i Patented Nevis; .1931 i @125 r liaround astandardq2:way telephonerepeater.

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linwr onk- 1 Hu or? sxsm A' iu catfinmeahugm 4,1930. Serial 110. 472,945..

I inventionrelates"tojtelephone sys- "tan-1s,- and more pa'r'jticularly to =1ines,',ar-

irarigedfor controlling automatic switches I Infeansof'current v i E51 ers or amplifiersarei lS QIted for theurpose of improving thejti'ans nission of speech he iqu n y n I q i e invention is to protect the An object of;

' repeaters from the" switching i'mpuls'es and l'PlQI'B p rticularly to prevent the V repeater 3 from interfering with or I afi'ectingthe'switch- Alfeature' off the invention the provision and called ends of the flinegforf disabling and I effectively discongi citing; the repeater during ".pl gv Another feature relates-to an arrangement eiline, j f The invention b willibe understood from the llowing description whenread in connec- 1 n rolling the energization of therepeat 'zer'ffrom the calledjen'd of th showsf, between: the vertical." broken lines A.A and B-B, a dial pulse byjpassj circuits The apparatus indicated bctw enfthe vertifoal vbroken line's-'AT A and D-jDj represent a ,i :{macliiiie switchingor dial ofiice, thatj'to 'the 9 left of line :D,.'D represents afdial subscrib- 'rers line ektended' to an outward; operators V J position and that totharightfloffthe} line .VYB B, apparatusrat a secondldial officeffor extending the line to a ,i'distant "ope'rat0r,s

: pQ SitiQnS. V l i p ,When the line of the calling subscriber S r isiextended ove'rthe selector switchlto the. ,contacts or the trunk 2, ground on the third" through to rpeater trunk, 5. Whenthis re"- peater trunk is seized a bridge is connected across the tipjandj ring conductors; which causes the line relay 6 in the byjpass circuit 4 to; operate in series rwithYtheline'u 'relay Tat the distant dial office; This i'circuit' 'niay be up traced from batteryf ett-hand windt'gjcf 1 relay J; ring co du r O t unk 8 "bnf f: tor 9, contacts lfOIof relay 11, upper-winding of relay- 6; contactsi'lof relay lfiycond'uctor 'inipuls'es, repeattoatlie tip of the line,'c

V 1 10,111 withjthe accompanying drawing which h 36f the switch lrc auses the trunk'switch- *itto plungeand connect the calling subscriber 16 ring conductor oftrunk 5, contacts .12. of

trunk r fi iiitcli twing conductor. oniun'k 2,

andthence thru'the subscribers equipment switch 4, conductor 17',"c0ntacts 18 of relay lower winding of relay 6, contacts19of relay l1, conductor 20, and tip oftrunk' 8 "to 'groundth'r'ough theright-hand winding of relay 7'. operation of relays 15 2mm 11in an obvious circuit overcontacts of; relay 21. i

., Relay Gin operatingcauses the ontacts 13 of trunk Relays 15 and 11in'operating remove the i normal v short-circuit across the input "ter- "mi'nals' ation' of relays 15 'an'd" 11ialso. place the 're- 2' peater in operative relation with the line by closing contacts and 31,2

openfcontacts, 14,18, and '19, thereby "transferring thepreviou'sly I [circuit through thewindingsi 32 and 33. of transformer Tginipedan ce @1140 ingsj3 and 35 of transformer T Y The? repeater. islnow' in" peat voi qe' frequency current.

f" the repeater, this being 'accorn plishedby opening contacts '22'and23 of're ndw ln,

condition toi-r'ei v Furthen'the operation of relays15and'11 traced by-pass t' fl whefnfrelayfi operated in series with relay 6 it caused the operation ofv relay 42 which;-

connected ground to conductor 41 thereby 'causing the operation of sleeve" relay 36; 1' Thisrelay," in operating, prepares a circuit i 'to operate relay 2lwhen relay 6 releaseson the first'open circuitimpulse fromthe subscrib'ers dial. ,7 Ground on conductor 41 also serves to hold operated all preceding selector or trunk switches as,; for example, trunk fpul ses but relay 2 1 Whichis e,ho 'l'ds up during pulsing and.

Relay 36 in operating also connected Y relays l5 andQ11. Relay 6'fol,-

means responsive tothe seizure of said line for, activating said repeater and connecting it in said line andresponsive to the actuation r of said imp ulse transmitter to disable and again disconnect said repeater during the actuation of said impulse transmitter. v

10. In a switching'system, a line divided V intortwo sections, an automaticswitch termin-ating at one end of said line, impulse j 1 transmitting means for controlling said switch associated with the other end of the line, a repeating device substantially opaque to said impulsesconnectingsaid line sections and means efiective during the transmission of impulses for maintaining a connecting path between said line sections independent 7 of said repeater. 5

V In witness whereof, we hereunto subscribe .our names this 1st day of. August, 1930.

' i- FRANHJIN A. KORN'. QFERDINAND S. ENTZ. 

